DRI钛渣制备钛白粉新工艺研究

DRI钛渣活性强,品位较高,便于实现钛的回收利用,可以代替钛铁矿生产钛白粉,是硫酸法钛白的发展趋势。然而,相对于钛铁矿来说,DRI钛渣的铁含量明显减少,钙镁铝含量提高明显,不能直接应用于现有的硫酸法钛白工艺。针对DRI工艺钛渣的工艺矿物学特征进行钛白粉制备新工艺的探索试验,成功开发了原料预除杂与硫酸法钛白相结合、以及酸解液沉铝与硫酸法钛白相结合的新工艺,均可制得高品质的钛白粉。

Study on New Process to Prepare Titanium Dioxide with DRI Titanium Slag

DRI titanium slag is easy to recovery for utilization due to its high quality and strong activity, and can be replaced for ilmenite to produce titanium dioxide, which is the development trend of titanium dioxide by sulfuric acid process. However, compared with ilmenite, iron content of DRI titanium slag drops significantly, content of calcium, magnesium and aluminum rise obviously, which cannot be directly applied to the existing sulfuric acid process. A new process to prepare titanium dioxide with DRI titanium slag is explored based on process mineralogy characteristics. High-quality titanium dioxide is successfully prepared by two processes including combination of pre-purification of raw materials and sulfuric acid process, and combination of aluminum precipitation from acid solution and sulfuric acid process.